well I think the best way to make new player that only played single-player games to adapt to multi-player is starting participate in mini-tournaments that can only accept players with less than 100 games
like theses
http://warlight.net/MultiPlayer?TournamentID=1515
http://warlight.net/MultiPlayer?TournamentID=1547
http://warlight.net/MultiPlayer?TournamentID=1542
the only problem is that u need the help of someone who is already a member in WL
and tournaments that help new players with "Light Fog" and "No Fog" games to learn the basics
http://warlight.net/MultiPlayer?TournamentID=1506
if u are trying to find a way to make new players to easy new player to transfer from single-player to multi-player